The Woods 59402 Indoor & Outdoor 40 AMP DPST 24-Hour Multi-Volt Mechanical Time Switch is a outdoor and indoor-rated double pole, single throw time switch that runs heavy duty appliances such as fountain and waterfall pumps, water heaters, air conditioners, pool pumps and other heavy duty equipment. Settings repeat at the same time daily, ideal for pools and heaters. Set up to 48 cycles per day to save money on energy costs and equipment wear and tear by only timing appliances to run when needed. Features include multiple voltage on one unit, manual ON/OFF switch, and an industrial-grade locking box. It also features never-lose pins in the timer, the pins are secured to prevent from falling out and becoming lost. Important Note: The manufacture reccommends that this product should be installed by licensed electrician.